Assessment of atrial conduction times in patients with frequent premature ventricular complex.

BACKGROUND

Premature ventricular complex (PVC) is a frequent finding in the general population. The atrial conduction time (ACT) is the period between the electrocardiographic P wave and the atrial mechanical contraction, and its prolongation indicates an atrial electromechanical delay (EMD). In our study, we compared atrial conduction parameters by echocardiographic methods between patients with frequent PVC and healthy control subjects.

METHODS

The study included 54 patients with PVC and 54 healthy volunteers. Atrial conduction parameters were measured with echocardiographic examination. The time difference between the p wave and the Am wave was measured in the septal, lateral, and tricuspid annulus regions. The interatrial EMD, left atrial intra-atrial delay, and the right atrial intra-atrial delay were calculated from these measurements. The groups were compared for demographic and electrocardiographic features and echocardiographic parameters.

RESULTS

Left intra-atrial EMD, right intra-atrial EMD, and interatrial EMD were significantly longer in the patient group ( = .001,  < .001,  < .001, respectively). PA lateral, PA septal, and PA tricuspid durations were significantly prolonged in the patient group (all  < .001). All ACT parameters were significantly prolonged in patients with PVC QRS duration of 150 ms and above (all  < .001). All ACT parameters were prolonged in PVCs of right ventricular origin than those of left ventricular origin (all  < .001). ACT parameters were prolonged in patients with a coupling interval time below 485 ms (all  < .001).

CONCLUSIONS

Atrial conduction times are prolonged in patients with frequent PVC.